二．单项填空：（每小题1分，共15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21．We don’t allow ___in the office. But you are allowed ____in the rest room.
A. smoking, smoking B. to smoke, to smoke
C. smoking, to smoke D. smoke, smoking
22. It was _____that we went camping on the mountain.
A such nice weather B. so nice a weather C. such a nice weather D. too nice weather
23．The patient was ___of losing his life and had to be operated on at once.
A. in danger B. in the danger C. out of danger D. out of the danger
